52 lines
1.2 KiB
Python
52 lines
1.2 KiB
Python
class Value:
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def __init__(self, initial=None):
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self.value = initial
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self.has_changed = True
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def set(self, value):
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self.has_changed = self.value != value
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self.value = value
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def is_changed(self):
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return self.has_changed
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def get(self):
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self.has_changed = False
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return self.value
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class ValueChanged(object):
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def __init__(self, on_changed, prec=2, initial=None):
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self.on_changed = on_changed
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self.prec = prec
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self.value = initial
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def set(self, value):
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has_changed = True
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value_rounded = round(value, self.prec)
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if self.value is not None:
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has_changed = self.value != value_rounded
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self.value = value_rounded
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if has_changed:
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self.on_changed(value_rounded)
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class AttributeChange(object):
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callbacks = {}
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def set_on_changed(self, key, on_changed: ValueChanged):
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if key not in self.callbacks:
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self.callbacks[key] = on_changed
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def __setattr__(self, key, value):
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try:
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old = super().__getattribute__(key)
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print("Change: {} from {} to {}".format(key, old, value))
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except:
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print("Create: {} and initialize with {}".format(key, value))
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super().__setattr__(key, value)
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if key in self.callbacks:
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self.callbacks[key].set(value)
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